1 #ifndef _I386_PAGE_H
2 #define _I386_PAGE_H
3
4 /* PAGE_SHIFT determines the page size */
5 #define PAGE_SHIFT 12
6 #define PAGE_SIZE (1UL << PAGE_SHIFT)
7 #define PAGE_MASK (~(PAGE_SIZE-1))
8
9 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
10 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
11
12 #ifdef __KERNEL__
13 #ifndef __ASSEMBLY__
14
15 #ifdef CONFIG_X86_USE_3DNOW
16
17 #include <asm/mmx.h>
18
19 #define clear_page(page) mmx_clear_page((void *)(page))
20 #define copy_page(to,from) mmx_copy_page(to,from)
21
22 #else
23
24 /*
25 * On older X86 processors it's not a win to use MMX here it seems.
26 * Maybe the K6-III ?
27 */
28
29 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
30 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
31
32 #endif
33
34 #define clear_user_page(page, vaddr, pg) clear_page(page)
35 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
36
37 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
38 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
39 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
40
41 /*
42 * These are used to make use of C type-checking..
43 */
44 extern int nx_enabled;
45
46 #ifdef CONFIG_X86_PAE
47 typedef struct { unsigned long pte_low, pte_high; } pte_t;
48 typedef struct { unsigned long long pmd; } pmd_t;
49 typedef struct { unsigned long long pgd; } pgd_t;
50 typedef struct { unsigned long long pgprot; } pgprot_t;
51
native_pgd_val(pgd_t pgd)52 static inline unsigned long long native_pgd_val(pgd_t pgd)
53 {
54 return pgd.pgd;
55 }
56
native_pmd_val(pmd_t pmd)57 static inline unsigned long long native_pmd_val(pmd_t pmd)
58 {
59 return pmd.pmd;
60 }
61
native_pte_val(pte_t pte)62 static inline unsigned long long native_pte_val(pte_t pte)
63 {
64 return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
65 }
66
native_make_pgd(unsigned long long val)67 static inline pgd_t native_make_pgd(unsigned long long val)
68 {
69 return (pgd_t) { val };
70 }
71
native_make_pmd(unsigned long long val)72 static inline pmd_t native_make_pmd(unsigned long long val)
73 {
74 return (pmd_t) { val };
75 }
76
native_make_pte(unsigned long long val)77 static inline pte_t native_make_pte(unsigned long long val)
78 {
79 return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
80 }
81
82 #ifndef CONFIG_PARAVIRT
83 #define pmd_val(x) native_pmd_val(x)
84 #define __pmd(x) native_make_pmd(x)
85 #endif
86
87 #define HPAGE_SHIFT 21
88 #include <asm-generic/pgtable-nopud.h>
89 #else /* !CONFIG_X86_PAE */
90 typedef struct { unsigned long pte_low; } pte_t;
91 typedef struct { unsigned long pgd; } pgd_t;
92 typedef struct { unsigned long pgprot; } pgprot_t;
93 #define boot_pte_t pte_t /* or would you rather have a typedef */
94
native_pgd_val(pgd_t pgd)95 static inline unsigned long native_pgd_val(pgd_t pgd)
96 {
97 return pgd.pgd;
98 }
99
native_pte_val(pte_t pte)100 static inline unsigned long native_pte_val(pte_t pte)
101 {
102 return pte.pte_low;
103 }
104
native_make_pgd(unsigned long val)105 static inline pgd_t native_make_pgd(unsigned long val)
106 {
107 return (pgd_t) { val };
108 }
109
native_make_pte(unsigned long val)110 static inline pte_t native_make_pte(unsigned long val)
111 {
112 return (pte_t) { .pte_low = val };
113 }
114
115 #define HPAGE_SHIFT 22
116 #include <asm-generic/pgtable-nopmd.h>
117 #endif /* CONFIG_X86_PAE */
118
119 #define PTE_MASK PAGE_MASK
120
121 #ifdef CONFIG_HUGETLB_PAGE
122 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
123 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
124 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
125 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
126 #endif
127
128 #define pgprot_val(x) ((x).pgprot)
129 #define __pgprot(x) ((pgprot_t) { (x) } )
130
131 #ifndef CONFIG_PARAVIRT
132 #define pgd_val(x) native_pgd_val(x)
133 #define __pgd(x) native_make_pgd(x)
134 #define pte_val(x) native_pte_val(x)
135 #define __pte(x) native_make_pte(x)
136 #endif
137
138 #endif /* !__ASSEMBLY__ */
139
140 /* to align the pointer to the (next) page boundary */
141 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
142
143 /*
144 * This handles the memory map.. We could make this a config
145 * option, but too many people screw it up, and too few need
146 * it.
147 *
148 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
149 * a virtual address space of one gigabyte, which limits the
150 * amount of physical memory you can use to about 950MB.
151 *
152 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
153 * and CONFIG_HIGHMEM64G options in the kernel configuration.
154 */
155
156 #ifndef __ASSEMBLY__
157
158 struct vm_area_struct;
159
160 /*
161 * This much address space is reserved for vmalloc() and iomap()
162 * as well as fixmap mappings.
163 */
164 extern unsigned int __VMALLOC_RESERVE;
165
166 extern int sysctl_legacy_va_layout;
167
168 extern int page_is_ram(unsigned long pagenr);
169
170 #endif /* __ASSEMBLY__ */
171
172 #ifdef __ASSEMBLY__
173 #define __PAGE_OFFSET CONFIG_PAGE_OFFSET
174 #else
175 #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
176 #endif
177
178
179 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
180 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
181 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
182 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
183 /* __pa_symbol should be used for C visible symbols.
184 This seems to be the official gcc blessed way to do such arithmetic. */
185 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
186 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
187 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
188 #ifdef CONFIG_FLATMEM
189 #define pfn_valid(pfn) ((pfn) < max_mapnr)
190 #endif /* CONFIG_FLATMEM */
191 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
192
193 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
194
195 #define VM_DATA_DEFAULT_FLAGS \
196 (VM_READ | VM_WRITE | \
197 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
198 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
199
200 #include <asm-generic/memory_model.h>
201 #include <asm-generic/page.h>
202
203 #define __HAVE_ARCH_GATE_AREA 1
204 #endif /* __KERNEL__ */
205
206 #endif /* _I386_PAGE_H */
207